From ed066cf0fe7d12dbdbddeda9446df698161d2e8d Mon Sep 17 00:00:00 2001
From: Rui Marinho <ruipmarinho@gmail.com>
Date: Sun, 26 Jul 2026 23:34:29 +0100
Subject: [PATCH] [espidf] Include .cc, .cxx and .c++ sources in the app source
 glob (#17754)

---
 esphome/build_gen/espidf.py               | 12 ++++++++++++
 tests/unit_tests/build_gen/test_espidf.py | 12 ++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/esphome/build_gen/espidf.py b/esphome/build_gen/espidf.py
index cc2fc5c4cd..cf476555e7 100644
--- a/esphome/build_gen/espidf.py
+++ b/esphome/build_gen/espidf.py
@@ -210,15 +210,27 @@ def get_component_cmakelists() -> str:
 if(CMAKE_SCRIPT_MODE_FILE)
     file(GLOB_RECURSE app_sources
         "${{CMAKE_CURRENT_SOURCE_DIR}}/*.cpp"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/*.cc"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/*.cxx"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/*.c++"
         "${{CMAKE_CURRENT_SOURCE_DIR}}/*.c"
         "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.cpp"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.cc"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.cxx"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.c++"
         "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.c"
     )
 else()
     file(GLOB_RECURSE app_sources CONFIGURE_DEPENDS
         "${{CMAKE_CURRENT_SOURCE_DIR}}/*.cpp"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/*.cc"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/*.cxx"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/*.c++"
         "${{CMAKE_CURRENT_SOURCE_DIR}}/*.c"
         "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.cpp"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.cc"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.cxx"
+        "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.c++"
         "${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.c"
     )
 endif()
diff --git a/tests/unit_tests/build_gen/test_espidf.py b/tests/unit_tests/build_gen/test_espidf.py
index bcd9fa655a..f21549b48c 100644
--- a/tests/unit_tests/build_gen/test_espidf.py
+++ b/tests/unit_tests/build_gen/test_espidf.py
@@ -184,6 +184,18 @@ def test_get_component_cmakelists_compile_flags_excluded_from_link_opts() -> Non
     assert "-Wl,--gc-sections" in content
 
 
+def test_get_component_cmakelists_globs_alternate_cpp_extensions() -> None:
+    """Both app_sources glob variants include .cc/.cxx/.c++ so vendored sources
+    are compiled, matching the extensions PlatformIO's builder globs by default."""
+    CORE.build_flags = set()
+    from esphome.build_gen.espidf import get_component_cmakelists
+
+    content = get_component_cmakelists()
+    for ext in ("cc", "cxx", "c++"):
+        assert content.count(f'"${{CMAKE_CURRENT_SOURCE_DIR}}/*.{ext}"') == 2
+        assert content.count(f'"${{CMAKE_CURRENT_SOURCE_DIR}}/esphome/*.{ext}"') == 2
+
+
 def test_get_project_cmakelists_emits_managed_components_property(
     tmp_path: Path,
 ) -> None: